<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script type="text/javascript">
			alert(d);
			var a=10;
			var b="hello";
			c=true;
			function fun(){
				alert("hello");
			}
			var d=30;
			
		</script>
	</head>
	<body>
	</body>
</html>
